Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 925 · 40 questions

What you do (Coins × distance): 1. Balance the ruler on the pencil at its 15 cm mark. 2. Put coins at a measured distance on the left side. 3. Place coins on the right and slide them until the ruler balances. 4. Check: coins × distance on the left = coins × distance on the right; press gently.

1. 1.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
2. 2.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
4. 4.⚙️ Which of these uses a pulley? (a) a slide (b) a flagpole (c) a see-saw (d) a bottle opener
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the number of coins”? (a) we change it (b) we measure it (c) we keep it the same
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) a flat table (d) a 30 cm ruler
7. 7.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
8. 8.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) a lever boosts your push (d) the spoon is magnetic
9. 9.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a battery cell (d) a 30 cm ruler
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we keep it the same (b) we measure it (c) we change it
11. 11.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
12. 12.⚙️ Which simple machine is a slide? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
13. 13.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
14. 14.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) bend it till it snaps (d) stand on the ruler
15. 15.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) bigger on the left (d) always 10
16. 16.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
17. 17.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) the same (d) easier
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we measure it (b) we change it (c) we keep it the same
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
20. 20.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a mirror (d) a flat table
21. 21.⚙️ Which simple machine is a tap handle? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
22. 22.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) both go up (d) the left side
23. 23.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a balloon (d) a flat table
25. 25.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) False (b) True
27. 27.⚙️ Which of these is a lever? (a) a slide (b) a see-saw (c) a well pulley (d) a steering wheel
28. 28.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
30. 30.⚙️ Which simple machine is a steering wheel? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
31. 31.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
32. 32.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) coins of one kind (d) a balloon
33. 33.True or false: a bottle opener is a wheel and axle. (a) True (b) False
34. 34.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
35. 35.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) jump up and down (d) sit farther from middle
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we keep it the same (b) we measure it (c) we change it
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we measure it (b) we change it (c) we keep it the same
38. 38.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
39. 39.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
40. 40.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) yeast (c) a 30 cm ruler (d) a mirror

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